Omega Seamaster Planet Ocean 600M Chronograph Watch, 45.5mm Grey Dial, 215.30.46.51.99.001It was with OMEGAs maritime legacy in mind that the brand launched its Planet Ocean line in 2005. Today, the stylish models continue to pay homage to OMEGAs dive watch heritage. This 45. 50 mm stainless steel model features a ceramised titanium dial with a small seconds counter and a date window, as well as 60 minute and 12 hour counters at the 3 o'clock position. Orange ceramic is used on the rings of the pushers and also for the unidirectional bezel